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Message-ID: <20250731105543.40832-11-yurand2000@gmail.com>
Date: Thu, 31 Jul 2025 12:55:28 +0200
From: Yuri Andriaccio <yurand2000@...il.com>
To: Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>,
Mel Gorman <mgorman@...e.de>,
Valentin Schneider <vschneid@...hat.com>
Cc: linux-kernel@...r.kernel.org,
Luca Abeni <luca.abeni@...tannapisa.it>,
Yuri Andriaccio <yuri.andriaccio@...tannapisa.it>
Subject: [RFC PATCH v2 10/25] sched/core: Initialize root_task_group
From: luca abeni <luca.abeni@...tannapisa.it>
Add the initialization function for task_group's dl_servers.
Initialize the default bandwidth for rt-cgroups and the root control group.
Add utility functions to check (and get) if a rt_rq entity is connected to a
real-time cgroup.
Co-developed-by: Alessio Balsini <a.balsini@...up.it>
Signed-off-by: Alessio Balsini <a.balsini@...up.it>
Co-developed-by: Andrea Parri <parri.andrea@...il.com>
Signed-off-by: Andrea Parri <parri.andrea@...il.com>
Co-developed-by: Yuri Andriaccio <yurand2000@...il.com>
Signed-off-by: Yuri Andriaccio <yurand2000@...il.com>
Signed-off-by: luca abeni <luca.abeni@...tannapisa.it>
---
kernel/sched/autogroup.c | 4 ++--
kernel/sched/core.c | 9 +++++++--
kernel/sched/deadline.c | 8 ++++++++
kernel/sched/rt.c | 18 ++++++++----------
kernel/sched/sched.h | 32 +++++++++++++++++++++++++++++---
5 files changed, 54 insertions(+), 17 deletions(-)
diff --git a/kernel/sched/autogroup.c b/kernel/sched/autogroup.c
index cdea931aae3..017eadc0a0a 100644
--- a/kernel/sched/autogroup.c
+++ b/kernel/sched/autogroup.c
@@ -52,7 +52,7 @@ static inline void autogroup_destroy(struct kref *kref)
#ifdef CONFIG_RT_GROUP_SCHED
/* We've redirected RT tasks to the root task group... */
- ag->tg->rt_se = NULL;
+ ag->tg->dl_se = NULL;
ag->tg->rt_rq = NULL;
#endif
sched_release_group(ag->tg);
@@ -109,7 +109,7 @@ static inline struct autogroup *autogroup_create(void)
* the policy change to proceed.
*/
free_rt_sched_group(tg);
- tg->rt_se = root_task_group.rt_se;
+ tg->dl_se = root_task_group.dl_se;
tg->rt_rq = root_task_group.rt_rq;
#endif /* CONFIG_RT_GROUP_SCHED */
tg->autogroup = ag;
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 42587a3c71f..3a69cb906c3 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8703,7 +8703,7 @@ void __init sched_init(void)
scx_tg_init(&root_task_group);
#endif /* CONFIG_EXT_GROUP_SCHED */
#ifdef CONFIG_RT_GROUP_SCHED
- root_task_group.rt_se = (struct sched_rt_entity **)ptr;
+ root_task_group.dl_se = (struct sched_dl_entity **)ptr;
ptr += nr_cpu_ids * sizeof(void **);
root_task_group.rt_rq = (struct rt_rq **)ptr;
@@ -8714,6 +8714,11 @@ void __init sched_init(void)
init_defrootdomain();
+#ifdef CONFIG_RT_GROUP_SCHED
+ init_dl_bandwidth(&root_task_group.dl_bandwidth,
+ global_rt_period(), global_rt_runtime());
+#endif /* CONFIG_RT_GROUP_SCHED */
+
#ifdef CONFIG_CGROUP_SCHED
task_group_cache = KMEM_CACHE(task_group, 0);
@@ -8765,7 +8770,7 @@ void __init sched_init(void)
* starts working after scheduler_running, which is not the case
* yet.
*/
- init_tg_rt_entry(&root_task_group, &rq->rt, NULL, i, NULL);
+ init_tg_rt_entry(&root_task_group, rq, NULL, i, NULL);
#endif
rq->sd = NULL;
rq->rd = NULL;
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 55b7f883815..b8228f553fe 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -538,6 +538,14 @@ static inline int is_leftmost(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq
static void init_dl_rq_bw_ratio(struct dl_rq *dl_rq);
+void init_dl_bandwidth(struct dl_bandwidth *dl_b, u64 period, u64 runtime)
+{
+ raw_spin_lock_init(&dl_b->dl_runtime_lock);
+ dl_b->dl_period = period;
+ dl_b->dl_runtime = runtime;
+}
+
+
void init_dl_bw(struct dl_bw *dl_b)
{
raw_spin_lock_init(&dl_b->lock);
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index a6282784978..38178003184 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -97,18 +97,16 @@ void free_rt_sched_group(struct task_group *tg)
return;
}
-void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
- struct sched_rt_entity *rt_se, int cpu,
- struct sched_rt_entity *parent)
+void init_tg_rt_entry(struct task_group *tg, struct rq *served_rq,
+ struct sched_dl_entity *dl_se, int cpu,
+ struct sched_dl_entity *parent)
{
- struct rq *rq = cpu_rq(cpu);
+ served_rq->rt.highest_prio.curr = MAX_RT_PRIO-1;
+ served_rq->rt.rq = cpu_rq(cpu);
+ served_rq->rt.tg = tg;
- rt_rq->highest_prio.curr = MAX_RT_PRIO-1;
- rt_rq->rq = rq;
- rt_rq->tg = tg;
-
- tg->rt_rq[cpu] = rt_rq;
- tg->rt_se[cpu] = rt_se;
+ tg->rt_rq[cpu] = &served_rq->rt;
+ tg->dl_se[cpu] = dl_se;
}
int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 2a7601d400c..3283d824859 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -577,9 +577,9 @@ extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b);
extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq);
extern bool cfs_task_bw_constrained(struct task_struct *p);
-extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
- struct sched_rt_entity *rt_se, int cpu,
- struct sched_rt_entity *parent);
+extern void init_tg_rt_entry(struct task_group *tg, struct rq *s_rq,
+ struct sched_dl_entity *rt_se, int cpu,
+ struct sched_dl_entity *parent);
extern int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us);
extern int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us);
extern long sched_group_rt_runtime(struct task_group *tg);
@@ -2669,6 +2669,7 @@ extern void resched_curr(struct rq *rq);
extern void resched_curr_lazy(struct rq *rq);
extern void resched_cpu(int cpu);
+void init_dl_bandwidth(struct dl_bandwidth *dl_b, u64 period, u64 runtime);
extern void init_dl_entity(struct sched_dl_entity *dl_se);
#define BW_SHIFT 20
@@ -3077,6 +3078,21 @@ static inline struct rq *rq_of_rt_se(struct sched_rt_entity *rt_se)
return rt_rq->rq;
}
+
+static inline int is_dl_group(struct rt_rq *rt_rq)
+{
+ return rt_rq->tg != &root_task_group;
+}
+
+/*
+ * Return the scheduling entity of this group of tasks.
+ */
+static inline struct sched_dl_entity *dl_group_of(struct rt_rq *rt_rq)
+{
+ BUG_ON(!is_dl_group(rt_rq));
+
+ return rt_rq->tg->dl_se[cpu_of(rt_rq->rq)];
+}
#else
static inline struct task_struct *rt_task_of(struct sched_rt_entity *rt_se)
{
@@ -3101,6 +3117,16 @@ static inline struct rt_rq *rt_rq_of_se(struct sched_rt_entity *rt_se)
return &rq->rt;
}
+
+static inline int is_dl_group(struct rt_rq *rt_rq)
+{
+ return 0;
+}
+
+static inline struct sched_dl_entity *dl_group_of(struct rt_rq *rt_rq)
+{
+ return NULL;
+}
#endif
DEFINE_LOCK_GUARD_2(double_rq_lock, struct rq,
--
2.50.1
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